Exp 1 flakiness and elongation index civil engineers pk. Then the passing aggregates were sieved passing 10mm bs sieve and retained on 6. The test is carried on aggregate sizes between 63 mm and 6. Methods for sampling and testing aggregates flakiness index. The aggregates were first sieved passing 14mm bs sieve and retained on 10mm bs sieve. Thickness gauge is used to determine if the aggregate particles are to be considered as flaky, i. This test is not applicable to sizes smaller than 6. What is the significance of flakiness index and elongation. Not so much different between both of the two values. Elongation index and flakiness index of coarse aggregate bs. Flakiness and elongation index of aggregate youtube.
It is mentioned in the test procedure bismorth that while doing combined flakiness and elongation test, the flaky aggregates should be separated initially from the test sample, and the rest is. Flakiness index sieve sets bs flakiness index utest. Dec 24, 2018 recommended values of flakiness index. The elongation index is found by separating the elongation particles and expressing their mess as a percentage of the mass of sample tested. The flakiness index is the total weight of the material passing the various thickness gauges or sieves, expressed as a percentage of the total weight of.
Flakiness index test is used to determine the particle shape of the aggregate and each particle shape being preferred under specific conditions. Flakiness index total mass of aggregate pass slots mass of test sample x 100 where. Aggregate quality for road construction will also influence the road performance. Flakiness and elongation test construction aggregate. Calculate the flakiness index to the nearest 0,1 as follows. A flakiness index test 1 sample of aggregates were prepared. Determination of the flakiness and the elongation index. Conclusion based on the objective for this experiment is to identify the flakiness and elongation index of the given aggregrate samples, we indentified the flakiness and elongation is not influenced each other. Definition of flakiness index and elongation index civil. The flakiness index is the total weight of the material passing the various thickness gauges or sieves, expressed as a percentage of the total weight of the sample gauged. Elongated and flaky stones are normally not very suitable for road works since the shape and the size make them difficult to compact. Elongation value is 0% because the aggregate is rounded so no any retain value.
The percentage of flaky and elongated particles that it contains. Flakiness and elongation test construction aggregate road. Dec 18, 2017 the elongation index is found by separating the elongation particles and expressing their mess as a percentage of the mass of sample tested. The flakiness index of an aggregate sample is found by separating the flaky particles and expressing their mass as a percentage of the mass of the sample tested.
Elongation index and flakiness index of coarse aggregate bs 812. An aggregate is classified as being flaky if it has a thickness. The test is not applicable to material passing a 6. For crushed aggregate, the particle shape and surface texture depend on the nature of the parent material and on the type of crusher and its reduction ratio. The test apparatus consists of a standard thickness gauge 6. Pdf determination of the flakiness and the elongation index for. Methods of test for aggregates for concrete, part i. Flakiness definition of flakiness by the free dictionary. Thickness gauge flakiness index bs flakiness index. Elongation index is the percentage by weight of particles in it, whose largest dimension i. Elongation index test on coarse aggreagtes elongation index of an aggregate is the percentage by weight of particles whose greatest dimension length is greater than one and fourfifth times 1. An adequate quantity of course aggregate is taken such that the minimum number of 200 pieces of any fraction can be tested.
The flakiness index of course aggregate is defined in percentage by weight of aggregate particles and least dimension thickness of those particles should not be less than 0. This test method covers tests for flat particles, elongated particles, or flat and elongated particles in coarse aggregate. It is expressed as the percentage by weight of particles in a sample of more than 200 whose smallest dimension is less than 0. Aug 11, 2014 the test apparatus consists of a standard thickness gauge 6. Each fraction is gauged in turn for thickness on the metal gauge. Elongation index and flakiness index of coarse aggregate. Determination of elongation index linkedin slideshare. Mar 03, 2012 the value that we get from this test is 15. The dried aggregates sample is allowed to passing and retained on a set of sieve. The total amount passing the gauge shall be weighed to an accuracy of at least 0.
Pdf 9 users english, pdf 5 users english, pdf 3 users english, pdf 1 user english more info on product formats. The flakiness index test fi is not applicable passing 6. The grid sieve set is used to determine the flakiness index of the aggregate. Shape tests on coarse aggregates such as flakiness index and elongation. It is mentioned in the test procedure bismorth that while doing combined flakiness and elongation test, the flaky aggregates should be separated initially from.
We have a new team dedicated to providing accurate and timely information about test flakiness to help developers and build monitors so that they know whether. May 08, 20 objective for determination of flakiness index of coarse aggregate, where the size of the coarse aggregate are larger than 6. Flakiness index test of aggregates construction technology and management. Pdf determination of the flakiness and the elongation index. Determination of the flakiness and the elongation index for the given aggregate sample. A total of 20 aggregates for each sieve were collected. August 2016 test procedure for determining flakiness index txdot designation. The flakiness index of aggregates is the percentage by weight of particles whose least dimension thickness is less than three fifths 0. The presence of flaky or elongated particles in excess of 1015% of the weight of coarse aggregate is undesirable. The percentage by weight of the elongated particles present in a given test sample. Grid sieve set uta uta0420 the grid sieve set is used to determine the flakiness index of the aggregate.
Follow these steps to determine the flakiness index. Mar 12, 2015 i flakiness index is the percentage by weight of particles in it, whose least dimension i. Determination of the flakiness and the elongation index for the given aggregate. Flat and elongated particles of coarse aggregates have a tendency to fracture more easily than. Flakiness index is the percentage by weight of particles in it, whose least dimension i. Flakiness index and elongation index of coarse aggregates. All the sieves include an electrostatically painted frame and stainless steel bars with a 5 mm diameter. Objective for determination of elongation index of coarse aggregate, where the size of the coarse aggregate are larger than 6.
Test procedure for determining flakiness index txdot designation. This test is for determining the flakiness index of aggregates used in asphalt surface treatments. What is the significance of flakiness index and elongation index. A flaky particle is the one whose least dimension thickness is less than 0. These are the materials of which the thickness is small as compared to the other two dimensions.
Determining flakiness index step action 1 obtain a representative sample of processed aggregates according to test method tex221f, sampling aggregate for bituminous mixtures, surface treatments, and limestone rock asphalt. Flakiness index test is conducted by using a metal thickness gauge. Objective for determination of flakiness index of coarse aggregate, where the size of the coarse aggregate are larger than 6. Uta0410 flakiness index sieve set consists of 7 sieves. Is the combined flakiness and elongation index of aggregate. Flakiness index of aggregate materials testing manual part 7, transport and main roads, november 2018 2 of 4 5.
All the sieves include an electrostatically painted frame. The percentage by weight of flaky particles present in a given test sample. Retained on flakiness percentage of bakiness index. Flakiness and elongation test of aggregate as per is 2386 part 1, content aggregator. The equipment used in the flakiness index are also used in the elongation index test except a metal length gauge instead of a thickness gauge shown in figure 7. The elongation index of an aggregate is the percentage by weight of particles whose greatest dimension length is. Jan 16, 2018 flakiness index test of aggregates construction technology and management. Flakiness and elongation test of aggregate as per is 2386 part 1, content aggregator duration. The particle shape of the aggregate is determined by. Flakiness sieves, aggregates testing equipment, controls. Flakiness index test is not applicable for aggregates sizes smaller than 6. Dec 18, 2017 determination of flakiness index test. This paper describes the importance of the particle shape of aggregates in road structures, and their determination, especially using the flakiness index test. Flakiness index and elongation index test on coarse aggregates.
988 21 1201 645 1358 851 1111 1209 753 1126 374 1423 110 424 20 578 549 1245 1284 1359 990 1320 1469 541 971 947 85 836 1083 324 706 658 606 983 1180 142 405 1397 614 262 999